bug#11701: 24.1.50; SIGBUS in libMagickCore when reconverting pdf files in doc-view-mode

[Andreas Politz]

When reverting a doc-view buffer, Emacs crashes receiving a SIGBUS error
(below is a back-trace).  I am not able to reproduce it without loading
my init file, but am able to reproduce it on a certain file constantly
otherwise.

The crash happens after doc-view deletes its cache files in
`doc-view-reconvert-doc' and starts to convert the PDF pages to PNG
files (and indirectly calling functions in the magick library).  It
seems that the deleted file is still mmapped and accessed in the library
at this point, leading to the error.

A. Politz

Program received signal SIGBUS, Bus error.
0x00007ffff44d99af in CopyMagickMemory () from /usr/lib/libMagickCore.so.3
(gdb) quit[K(gdb) bt
#0  0x00007ffff44d99af in CopyMagickMemory () from /usr/lib/libMagickCore.so.3
#1  0x00007ffff4419704 in ReadBlob () from /usr/lib/libMagickCore.so.3
#2  0x00007fffeb10068e in ?? () from 
/usr/lib/ImageMagick-6.6.0/modules-Q16/coders/png.so
#3  0x00007ffff5bccb3e in ?? () from /lib/libpng12.so.0
#4  0x00007ffff5bcdbf3 in ?? () from /lib/libpng12.so.0
#5  0x00007ffff5bd5b53 in png_read_row () from /lib/libpng12.so.0
#6  0x00007fffeb0ffcd5 in ?? () from 
/usr/lib/ImageMagick-6.6.0/modules-Q16/coders/png.so
#7  0x00007fffeb100184 in ?? () from 
/usr/lib/ImageMagick-6.6.0/modules-Q16/coders/png.so
#8  0x00007ffff4447d6e in ReadImage () from /usr/lib/libMagickCore.so.3
#9  0x00000000004e18f1 in imagemagick_load_image (f=0x1062ba0, img=0x234a3d0, 
contents=<value optimized out>, size=<value optimized out>,
    filename=<value optimized out>) at image.c:7681
#10 0x00000000004e851e in lookup_image (f=0x1062ba0, spec=36259398) at 
image.c:1733
#11 0x000000000044858d in handle_single_display_spec (it=0x7fffffff64c0, 
spec=36259398, object=34698469, overlay=<value optimized out>,
    position=0x7fffffff6608, bufpos=<value optimized out>, 
display_replaced_p=0, frame_window_p=1) at xdisp.c:4926
#12 0x0000000000448fa1 in handle_display_spec (it=0x7fffffff64c0, 
spec=36259398, object=34698469, overlay=<value optimized out>,
    position=<value optimized out>, bufpos=<value optimized out>, 
frame_window_p=1) at xdisp.c:4453
#13 0x000000000044916c in handle_display_prop (it=0x7fffffff64c0) at 
xdisp.c:4376
#14 0x000000000043731f in handle_stop (it=0x7fffffff64c0) at xdisp.c:3154
#15 0x00000000004375d8 in reseat (it=0x7fffffff64c0, pos=..., force_p=1) at 
xdisp.c:6167
#16 0x000000000044a5ad in start_display (it=0x7fffffff64c0, w=0x7ffff7e19097, 
pos=...) at xdisp.c:2867
#17 0x0000000000452b8c in try_window (window=<value optimized out>, pos=..., 
flags=1) at xdisp.c:16148
#18 0x00000000004578f5 in redisplay_window (window=<value optimized out>, 
just_this_one_p=<value optimized out>) at xdisp.c:15678
#19 0x0000000000459a84 in redisplay_window_0 (window=140737488293088) at 
xdisp.c:13760
#20 0x0000000000577179 in internal_condition_case_1 (bfun=<value optimized 
out>, arg=<value optimized out>, handlers=<value optimized out>,
    hfun=<value optimized out>) at eval.c:1486
#21 0x000000000043c9ae in redisplay_windows (window=140737352142999) at 
xdisp.c:13740
#22 0x000000000043c9d0 in redisplay_windows (window=140737352142999) at 
xdisp.c:13734
#23 0x000000000045a721 in redisplay_internal () at xdisp.c:13313
#24 0x000000000045b2d3 in redisplay_preserve_echo_area (from_where=-62240) at 
xdisp.c:13568
#25 0x00000000005b3ee2 in wait_reading_process_output (time_limit=<value 
optimized out>, microsecs=<value optimized out>, read_kbd=-1,
    do_display=1, wait_for_cell=11954562, wait_proc=<value optimized out>, 
just_wait_proc=0) at process.c:4478
#26 0x0000000000419564 in sit_for (timeout=180, reading=1, do_display=1) at 
dispnew.c:6068
#27 0x000000000050d8ab in read_char (commandflag=<value optimized out>, 
nmaps=<value optimized out>, maps=0x0, prev_event=<value optimized out>,
    used_mouse_menu=<value optimized out>, end_time=<value optimized out>) at 
keyboard.c:2698
#28 0x000000000050e6c0 in read_key_sequence (keybuf=<value optimized out>, 
bufsize=<value optimized out>, prompt=<value optimized out>,
    dont_downcase_last=<value optimized out>, can_return_switch_frame=<value 
optimized out>, fix_current_buffer=<value optimized out>)
    at keyboard.c:9344
#29 0x000000000051081b in command_loop_1 () at keyboard.c:1455
#30 0x00000000005772d1 in internal_condition_case (bfun=<value optimized out>, 
handlers=<value optimized out>, hfun=<value optimized out>)
    at eval.c:1448
#31 0x000000000050a52e in command_loop_2 (ignore=<value optimized out>) at 
keyboard.c:1160
#32 0x00000000005773f8 in internal_catch (tag=<value optimized out>, 
func=<value optimized out>, arg=<value optimized out>) at eval.c:1205
#33 0x000000000050abea in command_loop () at keyboard.c:1139
#34 recursive_edit_1 () at keyboard.c:759
#35 0x000000000050acfd in Frecursive_edit () at keyboard.c:823
#36 0x00000000004fd480 in main (argc=0, argv=0x7fffffffe458) at emacs.c:1711



In GNU Emacs 24.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2012-06-05 on cw-bkp0, modified by Debian
 (emacs-snapshot package, version 2:20120524-1+squeeze)
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--host' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.1.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.1.50/site-lisp:/usr/share/emacs/site-lisp'
 '--without-compress-info' '--with-crt-dir=/usr/lib//' '--with-x=yes'
 '--with-x-toolkit=gtk' '--with-imagemagick=yes'
 'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu'
 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g
 -Wl,--as-needed -znocombreloc' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: C
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  cl-format-font-lock-mode: t
  iswitchb-mode: t
  ispell-track-input-method: t
  recentf-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  workgroups-mode: t
  window-numbering-mode: t
  shell-dirtrack-mode: t
  TeX-PDF-mode: t
  savehist-mode: t
  outline-minor-mode: t
  ekey-mode: t
  eldoc-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  view-mode: t

Recent input:
C-, M-g M-p <return> C-x 1 C-x k <return> C-, g d o 
c - v i e w - d i s <tab> M-b u <tab> - <tab> M-h i 
- <tab> <return> C-c i c o n v e r t <tab> - c u <tab> 
<return> C-M-l C-M-l C-s p d f - M-m M-f C-c i <return> 
C-l C-l C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n M-f 
C-c i <return> C-n C-n C-n M-f C-c i <return> C-x b 
C-g C-x C-g M-x r e p o r <tab> b <backspace> b u g 
<return>

Recent messages:
Invalid face reference: nil [36 times]
uncompressing doc-view.el.gz...done
Note: file is write protected
View mode: type C-h for help, h for commands, q to quit.
Making completion list...
Mark set
Mark saved where search started
Mark set [3 times]
Quit
No expansion found

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